[bpd1069]

here's my contribution: the machine

http://wry.me/hacking/Turing-Drawings/#4,4,2,1,2,1,1,1,2,3,3...

[croikle]

Interestingly, that's quite similar to cookingrobot's.

[ https://news.ycombinator.com/item?id=5709406 ]

[oakwhiz]

After a while it looks like a parabola. Perhaps this is because the hypotenuse of a right triangle is the square root of 2?